Mayor Bill de Blasio and Council Speaker Melissa Mark-Viverito have agreed on a deal to expand the city's paid sick leave law, several sources told Capital.

The agreement will lower the threshold for the size of private companies required to provide their employees paid time off, the sources said.

The mayor and speaker are currently planning to announce the deal Friday, according to the sources.

The current law, passed over the objections and eventual veto of former mayor Michael Bloomberg last year, requires companies with 20 or more workers to give five paid sick days annually. It contains a provision that eventually lowers the threshold to businesses with at least 15 employees.

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The new deal will reduce further the size of companies covered, thereby expanding the number of businesses affected by the measure, said one source familiar with the agreement.

It will mark the first public agreement between the new mayor and speaker since Jan. 8, when Mark-Viverito was elected speaker with a push from de Blasio.

De Blasio campaigned on expanding the law to cover more New Yorkers, claiming the agreement Bloomberg struck with former Speaker Christine Quinn was too narrow.

Quinn stalled on the bill for three years because while many Democratic members wanted it, Bloomberg and the city's business establishment were vehemently opposed. She eventually agreed to pass the legislation, taking some focus off the issue during the Democratic mayoral primary last year.